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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90730a4439c2fd6667bde326144bca53bf4b0e55317c47e90f0314a6d5d8f828' 
  AND token = 'TwQi64JOiZH9C7bCeGWW/aJWty0R1l50bq5i3D7q3D0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}